Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 23, Issue 12, Pages 1999-2004Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(10)60662-6
Keywords
textile sludge; sludge incineration residue; aluminum reuse; acidification
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Funding
- National Natural Science Foundation of China [21007010]
- Research Fund for the Doctoral Program of Higher Education of China [20090075120007]
- Shanghai Committee of Science and Technology, China [09230500200]
- Fundamental Research Funds for the Central Universities of China [2011D11309]
- Shanghai Leading Academic Discipline Project [B604]
- Key Laboratory of Science & Technology of Eco-Textile [Eco-KF-2007-08]
- Joint Funds of Chinese Transportation Ministry and Hunan Province for Science and Technology Development [2010-353-343-290]
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The chemical composition and aluminum speciation of sludge incineration residue (SIR) were determined. Cementation of aluminum from sulfuric acid solution using SIR was studied. The results showed that acid-soluble inorganic aluminum was the predominant component in the sludge, and the total leached aluminum increased from 62.2% to 92.9% after incineration. Sulfuric acid dosage and reaction time were found to affect aluminum recovery positively. Conversely, the increase in temperature significantly inhibited recovery reactions. The optimized leaching condition was 1.66 g sulfuric acid per gram of SIR with a reaction time of 3 hr at 20 degrees C, resulting in the highest aluminum leaching rate of 96.7%. Compared to commercial aluminum sulfate solution coagulants, the leaching solution demonstrated higher CODCr, turbidity and color removal efficiency for textile wastewater.
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